Transparency issue with jit.gl.gridshape

    Hajjbaby
    Jul 24 2013 | 4:41 pm
    Hi guys,
    I am in need of a little help!
    I have created a large 5-sided cube (with a 6th, front side to be added) out of 5 flattened cubes from jit.gl.gridshape objects, and have placed a sphere inside which bounces about, reporting collisions with each face of the cube as it hits them. I am attempting to make each face transparent so that the sphere inside can be seen, but when it hits a face, I wanted that face to flash a certain colour, then return to being transparent.
    I have managed to work out the collision reporting, but I am stuck on this one transparency issue. I have searched about the forums and the only thing I've found is how to make a whole cube from one jit.gl.gridshape object transparent, which isn't what I'm after as I would want to trigger each face separately. Basically just need some idea on how to make a flattened cube shape transparent so that the black areas are see-through, but colours become visible when collisions occur.
    I have posted the patch, hope it's okay to read. Thanks in advance for any assistance given!
    • Rob Ramirez
      Jul 24 2013 | 7:40 pm
      for transparent objects, you must set @depth_enable 0 @blend_enable 1. you then want to make all the transparent objects draw last, by setting @layer to some high value (eg 100)
      you can then control transparency with the alpha value of the the color attribute. you probably don't want to attach a jit.gl.material to your transparent objects, because that complicates things and is probably unnecessary.
      i would also use jit.gl.gridshape @shape plane instead of cube for your walls, however if you need to use cube, i would turn on back-face culling (@cull_face 1).
      try those things out, and let us know if you still can't get it working.
    • Hajjbaby
      Jul 25 2013 | 12:35 pm
      Awesome, it works! Made the changes you suggested as well as trying out different blend modes which was suggested by somebody in my post to the wrong (Max/MSP) forum, combining the two solved the issue!
      Thanks a lot for the help.